--- /dev/null
+'use strict';
+var redefineAll = require('../internals/redefine-all');
+var getWeakData = require('../internals/internal-metadata').getWeakData;
+var anObject = require('../internals/an-object');
+var isObject = require('../internals/is-object');
+var anInstance = require('../internals/an-instance');
+var iterate = require('../internals/iterate');
+var ArrayIterationModule = require('../internals/array-iteration');
+var $has = require('../internals/has');
+var InternalStateModule = require('../internals/internal-state');
+
+var setInternalState = InternalStateModule.set;
+var internalStateGetterFor = InternalStateModule.getterFor;
+var find = ArrayIterationModule.find;
+var findIndex = ArrayIterationModule.findIndex;
+var id = 0;
+
+// fallback for uncaught frozen keys
+var uncaughtFrozenStore = function (store) {
+ return store.frozen || (store.frozen = new UncaughtFrozenStore());
+};
+
+var UncaughtFrozenStore = function () {
+ this.entries = [];
+};
+
+var findUncaughtFrozen = function (store, key) {
+ return find(store.entries, function (it) {
+ return it[0] === key;
+ });
+};
+
+UncaughtFrozenStore.prototype = {
+ get: function (key) {
+ var entry = findUncaughtFrozen(this, key);
+ if (entry) return entry[1];
+ },
+ has: function (key) {
+ return !!findUncaughtFrozen(this, key);
+ },
+ set: function (key, value) {
+ var entry = findUncaughtFrozen(this, key);
+ if (entry) entry[1] = value;
+ else this.entries.push([key, value]);
+ },
+ 'delete': function (key) {
+ var index = findIndex(this.entries, function (it) {
+ return it[0] === key;
+ });
+ if (~index) this.entries.splice(index, 1);
+ return !!~index;
+ }
+};
+
+module.exports = {
+ getConstructor: function (wrapper, CONSTRUCTOR_NAME, IS_MAP, ADDER) {
+ var C = wrapper(function (that, iterable) {
+ anInstance(that, C, CONSTRUCTOR_NAME);
+ setInternalState(that, {
+ type: CONSTRUCTOR_NAME,
+ id: id++,
+ frozen: undefined
+ });
+ if (iterable != undefined) iterate(iterable, that[ADDER], that, IS_MAP);
+ });
+
+ var getInternalState = internalStateGetterFor(CONSTRUCTOR_NAME);
+
+ var define = function (that, key, value) {
+ var state = getInternalState(that);
+ var data = getWeakData(anObject(key), true);
+ if (data === true) uncaughtFrozenStore(state).set(key, value);
+ else data[state.id] = value;
+ return that;
+ };
+
+ redefineAll(C.prototype, {
+ // 23.3.3.2 WeakMap.prototype.delete(key)
+ // 23.4.3.3 WeakSet.prototype.delete(value)
+ 'delete': function (key) {
+ var state = getInternalState(this);
+ if (!isObject(key)) return false;
+ var data = getWeakData(key);
+ if (data === true) return uncaughtFrozenStore(state)['delete'](key);
+ return data && $has(data, state.id) && delete data[state.id];
+ },
+ // 23.3.3.4 WeakMap.prototype.has(key)
+ // 23.4.3.4 WeakSet.prototype.has(value)
+ has: function has(key) {
+ var state = getInternalState(this);
+ if (!isObject(key)) return false;
+ var data = getWeakData(key);
+ if (data === true) return uncaughtFrozenStore(state).has(key);
+ return data && $has(data, state.id);
+ }
+ });
+
+ redefineAll(C.prototype, IS_MAP ? {
+ // 23.3.3.3 WeakMap.prototype.get(key)
+ get: function get(key) {
+ var state = getInternalState(this);
+ if (isObject(key)) {
+ var data = getWeakData(key);
+ if (data === true) return uncaughtFrozenStore(state).get(key);
+ return data ? data[state.id] : undefined;
+ }
+ },
+ // 23.3.3.5 WeakMap.prototype.set(key, value)
+ set: function set(key, value) {
+ return define(this, key, value);
+ }
+ } : {
+ // 23.4.3.1 WeakSet.prototype.add(value)
+ add: function add(value) {
+ return define(this, value, true);
+ }
+ });
+
+ return C;
+ }
+};